Computer casing



FIG. 1 is a front, right perspective view of the computer casing showing our new design with the port door opened;

FIG. 2 is a front right perspective view thereof with the port door closed;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a front elevational view thereof with the door opened;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof;

FIG. 7 is a left side elevational view thereof; and,

FIG. 8 is a right side elevational view thereof. 

The ornamental design for a computer casing, as shown and described. 